How Banks Assess Rental Income for Your Borrowing Power
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Mortgagefy
Investor 9 min read Updated Apr 2026

How Banks Assess Rental Income for Your Borrowing Power

By the Mortgagefy Team · Published · Last reviewed

Every lender treats rental income differently. The right lender can count 10–20% more of your rental income — dramatically increasing how much you can borrow. Here's the exact formula banks use.

How Banks Assess Rental Income for Your Borrowing Power — Mortgagefy guide
70–80%
Typical rental income shade rate
$40K
Borrowing power difference between 70% vs 80% shade on $650/wk rent
Add-back
Some lenders credit negative gearing tax saving

The Rental Income Shading Formula

When you receive rental income, banks do not count 100% of it in their serviceability calculation. They apply a "shade" or "haircut" to account for vacancy, maintenance, and other costs. The standard shade rate in Australia is 70–80% of gross annual rental income.

Example of how shading affects borrowing power:
Weekly rent: $650 | Annual rental income: $33,800

At 70% shade: $33,800 × 70% = $23,660/year counted
At 80% shade: $33,800 × 80% = $27,040/year counted
Difference: $3,380/year
Borrowing power difference (at ~8% test rate): ~$42,000 more with an 80% shade lender

Actual vs Assessed Rent

Lenders use different base figures for rental income calculations:

  • Some lenders use actual rent received: The amount on your lease or most recent tax return statement
  • Some lenders use appraised rent: A property manager's written rental appraisal (which may be higher or lower than current rent)
  • Major banks typically use the lower of actual vs appraisal: Protecting themselves from inflated appraisals
  • Non-bank lenders may use the higher: Particularly if you can demonstrate current market rates

Lender Comparison Table: Rental Income Treatment

LenderShade RateBasisNegative Gearing Add-backHoliday Rental
CBA80%Actual or 75 wk market rateNo50% shade, 2yr history
ANZ80%Actual from tax returnYes (PAYG borrowers)50% shade, 2yr history
Westpac75%Lower of actual or appraisalNoNot accepted (1yr min)
NAB80%Actual from lease or tax returnYes50% shade
Macquarie80%Market rental appraisalYesCase by case
Non-bank lenders70–80%Varies by lenderSometimesOften more flexible

How Negative Gearing Add-Back Works

Some lenders recognise that negative gearing creates a tax benefit — and add this back to your effective income. Example:

Negative gearing add-back:
Net rental loss: $12,000/year
Marginal tax rate: 37%
Tax saving: $4,440/year

Without add-back: Your income for servicing is reduced by $12,000 (the net rental loss counts as an expense)
With add-back: Your income is only reduced by $7,560 ($12,000 × 37% = $4,440 added back)

Rental Income from a New Investment Property

If you're buying a new investment property, you can include the estimated rental income even before you've received any. The lender requires:

  • A rental appraisal letter from a licensed real estate agent
  • The letter must be on agency letterhead and address the specific property
  • Most lenders accept letters dated within 90 days of application
  • The estimated rent is then shaded at the standard 70–80%

SMSF Rental Income

Rental income from properties held in a Self-Managed Super Fund (SMSF) is generally not counted in personal borrowing power calculations — because the property is a separate legal entity (the SMSF) and the income is trapped in the fund. Only a broker specialising in SMSF lending can structure applications to maximise your position.

How to Maximise Rental Income in Your Application

  • Use a lender with 80% shade (not 70%) — this alone can increase borrowing power by tens of thousands
  • Get current rental appraisal letters for all properties — if the current rent is below market, an appraisal may show a higher figure the lender will use
  • Declare all rental income in your tax return — undeclared income cannot be counted by lenders
  • Choose a lender that applies negative gearing add-back — some lenders recognise the tax benefit as effective income
  • Time your application carefully — most lenders require a 12-month history of consistent rental income; a new tenancy in the month before application may not count

Frequently Asked Questions

Most Australian lenders count 70–80% of gross rental income. This shading accounts for vacancy periods, management fees, and maintenance. Lender policies vary significantly — choosing the right lender can increase your borrowing power substantially.
Yes. Lenders accept estimated rental income for a property you're purchasing, provided it's supported by a real estate agent's rental appraisal letter. The estimated rent is then shaded at 70–80% like existing rental income.
Some lenders add back the tax benefit of negative gearing deductions. If your rental property has a $10,000 net loss and your tax rate is 37%, the $3,700 tax saving is added back to your effective income. Not all lenders do this.
Holiday rental income is assessed with a higher vacancy buffer (typically 50% shade). Most major banks require 2 years of holiday rental income history via tax returns. Non-bank lenders are sometimes more flexible.
Use a lender with 80% shade; get current rental appraisal letters; declare all rental income in your tax return; choose a lender that applies negative gearing add-back; and consider non-bank lenders who shade at 80% rather than 70%.

Find Out Your Real Investment Borrowing Power

We model your rental income across 30+ lenders and find the one that counts the most of it — maximising what you can borrow for your next investment.

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